Why would a girl suddenly stop texting me after it seemed our first couple dates went so well?

Started dating this girl for a few months and we text back and fourth constantly, she was totally into me and always asked to see me.

But all of a sudden she stopped texting as much and when I'd ask to see her, she wouldn't reply back. We could text all day but as soon as I mention if she would meet me, she won't reply. So when she flakes on me, I just don't bother texting. A few weeks pass and then she'd randomly text me and the cycle starts again.

Now I haven't a clue if I'm wasting my time with this girl.